using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace TimusOJ
{
    class Program
    {
        static void Main(string[] args)
        {
            int lock1 = 0;
            int lock2 = 0;
            bool inputValid = true;

            while (inputValid)
            {
                lock1 = Convert.ToInt32(Console.ReadLine());
                lock2 = Convert.ToInt32(Console.ReadLine());
                if (lock1 > 0 && lock1 < 10000 && lock2 > 0 && lock2 < 10000)
                {
                    inputValid = false;
                }
            }

            if (lock1 % 2 == 0 || lock2 % 2 == 1)
            {
                Console.WriteLine("yes");
            }
            else
            {
                Console.WriteLine("no");
            }
        }
    }
}
